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Showing content from https://timsong-cpp.github.io/cppwp/n4659/unord.set.syn below:

[unord.set.syn]

26 Containers library [containers] 26.5 Unordered associative containers [unord] 26.5.3 Header <unordered_­set> synopsis [unord.set.syn]
#include <initializer_list>

namespace std {
    template <class Key,
            class Hash = hash<Key>,
            class Pred = equal_to<Key>,
            class Alloc = allocator<Key>>
    class unordered_set;

    template <class Key,
            class Hash = hash<Key>,
            class Pred = equal_to<Key>,
            class Alloc = allocator<Key>>
    class unordered_multiset;

  template <class Key, class Hash, class Pred, class Alloc>
    void swap(unordered_set<Key, Hash, Pred, Alloc>& x,
              unordered_set<Key, Hash, Pred, Alloc>& y)
      noexcept(noexcept(x.swap(y)));

  template <class Key, class Hash, class Pred, class Alloc>
    void swap(unordered_multiset<Key, Hash, Pred, Alloc>& x,
              unordered_multiset<Key, Hash, Pred, Alloc>& y)
      noexcept(noexcept(x.swap(y)));

  template <class Key, class Hash, class Pred, class Alloc>
    bool operator==(const unordered_set<Key, Hash, Pred, Alloc>& a,
                    const unordered_set<Key, Hash, Pred, Alloc>& b);
  template <class Key, class Hash, class Pred, class Alloc>
    bool operator!=(const unordered_set<Key, Hash, Pred, Alloc>& a,
                    const unordered_set<Key, Hash, Pred, Alloc>& b);
  template <class Key, class Hash, class Pred, class Alloc>
    bool operator==(const unordered_multiset<Key, Hash, Pred, Alloc>& a,
                    const unordered_multiset<Key, Hash, Pred, Alloc>& b);
  template <class Key, class Hash, class Pred, class Alloc>
    bool operator!=(const unordered_multiset<Key, Hash, Pred, Alloc>& a,
                    const unordered_multiset<Key, Hash, Pred, Alloc>& b);

  namespace pmr {
    template <class Key,
              class Hash = hash<Key>,
              class Pred = equal_to<Key>>
      using unordered_set = std::unordered_set<Key, Hash, Pred,
                                               polymorphic_allocator<Key>>;

    template <class Key,
              class Hash = hash<Key>,
              class Pred = equal_to<Key>>
      using unordered_multiset = std::unordered_multiset<Key, Hash, Pred,
                                                         polymorphic_allocator<Key>>;
  }
}

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